* {
    padding: 0;
    margin: 0;
    list-style: none;
    user-select: none;
    box-sizing: border-box;
}

html,
body {
    width: 100vw;
    height: 100vh;
    position: relative;
}

#canvas {
    z-index: 10;
}

#bg {
    background: #e3e3e3;
}

.btns-cover {
    position: absolute;
    display: inline-block;
    z-index: 100;
}

canvas {
    position: absolute;
    width: 100%;
    height: 100%;
    position: absolute;
}
